For the past month, Idris has gone to bed at 10.30 pm on most nights but remained awake until after 1 am. Once asleep, he does not wake before his alarm. During the day, he feels tired and struggles to concentrate in lessons.
Explain the type of insomnia shown by Idris's sleep pattern. Use information from the source in your answer.
53 exam-style questions on OCR GCSE Psychology 6.1 Key Concepts, covering 6.1.1 Functions, features and benefits of sleep, 6.1.2 Causes of sleep disorders, and 6.1.3 Endogenous pacemakers and exogenous zeitgebers. Each one has a worked solution and a mark scheme showing where the marks go.